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Spring 学习总结使用静态工厂创建Bean

2016-06-21 20:10 686 查看

创建Bean时，class属性必须指定，此时为静态工厂类。 factory-method指定静态工厂方法名。

接口：

public interface Being {
public void testBeing();
}

Dog类

public class Dog implements Being{

private String msg;

public void setMsg(String msg) {
this.msg = msg;
}

@Override
public void testBeing() {
System.out.println(msg + " 狗爱啃骨头");

}

}

Cat类

public class Cat implements Being{

private String msg;

public void setMsg(String msg) {
this.msg = msg;
}

@Override
public void testBeing() {
System.out.println(msg + " 猫爱吃老鼠!");

}

}

　

Bean里配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="dog" class="com.springtest2.factory.BeingFactory"
factory-method="getBeing">
<constructor-arg value="dog" />
<property name="msg" value="我是狗" />
</bean>

<bean id="cat" class="com.springtest2.factory.BeingFactory"
factory-method="getBeing">
<constructor-arg value="cat" />
<property name="msg" value="我是猫" />
</bean>

</beans>

　调用测试

private static void testFactory(){
ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"beans_factory.xml"});
Being b1 = context.getBean("dog", Being.class);
b1.testBeing();

Being b2 = context.getBean("cat", Being.class);
b2.testBeing();
}

输出结果

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Spring 学习总结 使用静态工厂创建Bean

Spring 学习总结使用静态工厂创建Bean